Stone-crusher head.



W. G. NICHOLS.

l STONE GRUSHER HEAD, APPLICATION FILED sEPT.6.19oe.

- W. G. NICHOLS.

STONE CRUSHER HEAD.

APPLIoATIoN FILED sEPT.s,1soe.

Patented Nov. 16, 1909.

2 SHEETS-SHEET 2.

WESLEY Gr. NICHOLS, OF CHICAGO, ILLINOIS FOUNDRY COMPANY, OF JERSEYCITY,

JERSEY.

, ASSIGNOR TO AMERICAN BRAKE SHOE & NEW JERSEY, A CORPORATION OF NEWSTONE-CRUSHER HEAD.

Specification of Letters Patent.

Patented Nov. 16, 1909.

Application filed September 6, 1906. Serial No. 333,559.

To all whom t muy concern.

Be it known that I, WESLEY Gr. NICHOLS, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and usei ful Improvements in Stone-Crusher Heads,of which the following is a specification.

My invention relates to improvements in heads for gyrating stonelCrushers.

The salient object of my invention is to provide a stone-crusher-headconstruction whereby I am enabled to employ a crushing surface ofmanganese steel, and am enabled to obviate or avoid the dii'licultieswhich have heretofore rendered the employment of this particularmaterial impracticable.

More specifically an object of my invention is to provide a constructionwhereby I am enabled to employ a relatively thin renewable manganesesteel wearing surface, or mantle, in association with a permanent coreof ordinary steel.

A further object of my invention is to provide a construction whereinprovision is made to compensate for the tendency of the manganese steelto stretch and distort under the strains and stresses incident to use,so that by distortion or stretching the mantle may not lose itsefficiency in operation, or injure the associated core or shaft.

Another object of my invention is to provide a construction of maximumstrength and rigidity at the plane where the maximum crushino` action iseected.

Other and further objects of my invention will best become apparent fromthe following description, taken in conjunction with the drawings,wherein,

Figure 1 is a section of my improved Crusher head complete. Fig. 2 is anend view of the mantle detached. Fig. 3 is a central section of themantle detached. Fig. 4 is an elevation, with a fragment in section, ofthe core, and Fig. 5 is a section of the core on line 5-5 of Fig. 4.

Throughout the drawings like numerals of reference refer always to likeparts.

Referring now to the drawings, 10 indicates the tapered Crusher shaft,threaded as at 11, for the reception of jam-nuts 12-12, which overliethe upper end of the core 18, secured upon the shaft, to preventvertical shifting of said core.

In the general configuration the core provides a reduced upper zone 14of cylindrical I shape, upon the top surface 15 whereof, the

jam-nut bears, said reduced, cylindrical portion, 14, terminating at ashoulder 16. Below the shoulder 16 is a tapered or conical zone 17,subjacent to which is a truly cylindrical Zone 18, contiguous to thearca on which the greatest crushing strain falls. Below the Zone 18 arethe beveled, or conical Zones, 19 and 20.

In the enlarged portion of the core, at suitable distances apart,preferably on quadrants of a circle, are cut vertical grooves 21,extending from the shoulder 16 to the bottom of the Zone 19, and havingtheir bottom surfaces at a distance from the axis of the core not lessthan the radius of the cylindrical portion 14, of the core, said groovescommunicating at their lower ends with lateral grooves 22, extending tolike depth, and preferably extending in both directions from thevertical groove, forming with the groove 21, an inverted-'lu groove fora doublebayonet joint.

23 indicates in general a mantle, of any usual exterior configuration,preferably generally conical exteriorly and interiorly, and relativelythin, said mantle being composed of manganese steel, cast and ground toprovide an interior configuration comprising interiorly the cylindricalwall 24, shoulder 26, conical portion 27, cylindrical portion 28 andconical portions 29 and 30, shaped t0 correspond and intert with therespective portions 14, 16, 17, 18, 19 and 20 of the core. In verticaldimensions the zones 27, 28 and 29 of the mantle correspond with themeasurement of the coacting part of the core, while the zones 24 and 30of the mantle are shorter than the coacting part of the core. From theZone 29 of the mantle, there project inwardly lugs 31, of suitable shapeto pass vertically through the slot 21 in the core, and rotarily intothe lateral slots 22, the lugs 31 being of slightly less vertical extentthan the slots 22, and the parts being so arranged that when shoulder 26of the mantle bears upon shoulder 16 of the core, the upper surfaces ofthe lugs engage the top surfaces of the grooves 22, leaving a slightspace between the bottoms of each lug and the like surface of thegroove.

As illustrated in Fig. l. the parts should be so accurately made as toproduce close fits between the respective zones of contact, and the lugsshould at their radially inner surfaces effect bearing contact with theradially inner surfaces of the slotI 22. ln each lug is provided arecess 32, and through the lower Zone of the core take verticalsetscrews 33, in such position that they may be engaged with therecesses 32, when the lugs 31 are properly home in their rooves 32.

In many particulars the contraction described is particularly adapted tothe employment of manganese steel in the mantle construction. lt is tobe noted that the construction described permits of the use ofrelatively thin mantlcs, at no point far removed from a superficial areasusceptible of treatment in the process of tempering. This is important,as it is a well known fact that to secure the best results .in usearticles of manganese steel should be tempered throughout the entirebody, and further, that it is practicable to temper manganese steel onlyto the depth of a few inches from an exterior surface. ft is also wellknown that manganese is of such tough and homogeneous character that itcan not be turned or tooled after the fashion of common steel, but canbe finished only by abrading, as by an emery wheel. It is to be notedthat the interior configuration of the mantle is such as to permit readygrinding of all surfaces which are required to make close fit with theexterior surfaces of the core, while the core is of common steel, whichmay be machined in the ordinary manner to effect the snug fit with themantle necessary to the best construction of the composite Crusher head.

A further characteristic of manganese steel is that, while so imperviousto cutting tools, it stretches materially under severe stress or strain,or when subjected to a peening action.

ln my improved construction the stretching of the mantle produces nodeleterious effect. ft is to be noted that longl bearing surfaces, oftruly cylindrical form, are provided at the zones l-f, 18, and 24C, Q8,of the core and mantle respectively, so that the longitudinal, axialstretching of the mantle, due to its grinding activity does not resultin a loss of fit between the core and mantle, or material loosening ofthe mantle on the core. Furthermore, the extension of the zone lil ofthe core, beyond the confines of the corresponding zone 2li of themantle, prevents the mantle in stretching from contacting with andstripping from their threads the jam-nuts l2. Likewise the extension ofthe conical zone 20 of the core below the coacting area 3G of themantle, permits of the downward extension of the mantle understretching, without distorting of the general shape of the mantle andwithout peri'nitting the mantle to envelop the lower edges of the core.

ln assembling the parts the mantle is slipped on to the core with itslugs 31 takmg into the grooves 2l of the core, and then the mantle isrotated t1) bring the lugs 3l into those extensions of theircorrespondmg grooves, which lie in rear of the vertical grooves 2Q withreference to proposed direction of rotation of the head. When thuspositioned, the set screws 33 are turned home to seat in the recesses 32of the lugs,

and the parts thereby positively secured together.

ft is to be noted that at the point of maximum crushing strain, which isat about the level of the zone 29, the lugs of the mantle 3i make closecontact at their radially inner ends with the core, and that positiveconnection is effected between the core and mantle in such Zone, whilein the Zone immediately above a cylindrical bearing contact is effectedbetween the core and mantle, which as described is not a-Hected by anystretching which may occur in the mantle. rihus firm anchorage isafforded the mantle at the plane of greatest activity, and compensationis afforded for stretching above and below the anchorage.

Variations of details of construction willL occur to those skilled inthe art without departure from the spirit of my invention.

Having thus described my invention, what I claim and desire to secure byLetters Patent, of the United States, is

l. A composite Crusher head, comprising a hollow, generally-conicalmanganese steel mantle, a coacting generally-conical core within saidmantle, longer than the mantle to permit a vertical extension of saidman tle without loosening the supportA of the core, means effectingpositive but detachable connections between the mantle and core only ina single zone below the middle of the mantle.

2. A composite Crusher head, comprising a hollow, generally-conicalmanganese steel mantle, a common steel core shaped generally forcoact-ion with said mantle, extending above the mantle at its upper end,in cylindrical form coinciding with a cylindrical upper portion in theinner surface of the mantle, and means effecting positive connectionbetween the mantle and core in a single Zone below the middle of themantle, whereby a longitudinal extension of the mantle above the zone ofpositive connection dees not free the mantle from the support of thecore at its upper end.

3. The combination with a tapering shaft, of a core fitting thereon, jamnuts threaded on said shaft above the core, a mantle carried by thecore, and effecting positive connection with the core only in a zonebelow the middle of the core, said mantle and core being provided withcylindrical coacting surfaces adjacent their upper end, the cylindricalsurface of the core extending beyond the end surface of the mantle tothe end of the core with which the jam nuts coact,

whereby longitudinal stretching of the mantle to the end of the core maynot free i said mantle from support of the core or disturb the jam nuts.i 4. In a composite crusher head, a hollow, generally conicalmanganese-steel mantle, a coacting generally conical core, said core andmantle being provided at different ver- I tical planes with cylindricalzones of varyino' diameters for maintaining contact under l di erentconditions of stretching of the mantle and means for securing saidmantle and core together. i 5. In a composite crusher head, a core of ,i

generally conical exterior shape, a manganese steel mantle of generallyconical shape intertting therewith, and means positively connecting saidmantle with the core only in a zone below the center of the mantle, saidcore and mantle being provided with coacting cylindrical surfacesclosely contiguous to said zone of positive connection.

In testimony whereof I hereunto set my hand in the presence of twowitnesses.

WESLEY G. NICHOLS. In the presence 0f- CHARLES GUEST, C. G. BAIR.

